Thank you for visiting nature.com. You are using a browser version with limited support for CSS. To obtain
the best experience, we recommend you use a more up to date browser (or turn off compatibility mode in
Internet Explorer). In the meantime, to ensure continued support, we are displaying the site without styles
and JavaScript.
A monolayer of cultured cells derived from the microvascular endothelium of a human brain. The cells are immunofluorescently stained to show the presence of proteins associated with tight junctions. Image is from the protocol by Bernas et al. on p. 1247. Cover design by Jamel Wooten.